This sales pitch doesn't impress me. The internet isn't fun or weird any longer because corporations have taken over, and most normies aren't going to bother to learn how to build and operate their own websites. Just like most normies aren't going to bother to become their own sysadmins so they can run GNU/Linux on their PCs. Most people are fine with the Web being what it is today: QVC with a comments section.
MySpace was owned by a corporation, but allowed massive customization including custom CSS anyway. Youtube also allowed way more customization in the past (remember the old profile pages?), all those small local social networks that often allowed straight custom HTML died when Facebook expanded worldwide, they were mostly for-profit.